tint->dawn: Shuffle source tree in preperation of merging repos

docs/    -> docs/tint/
fuzzers/ -> src/tint/fuzzers/
samples/ -> src/tint/cmd/
src/     -> src/tint/
test/    -> test/tint/

BUG=tint:1418,tint:1433

Change-Id: Id2aa79f989aef3245b80ef4aa37a27ff16cd700b
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/80482
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
diff --git a/src/tint/ast/bitcast_expression_test.cc b/src/tint/ast/bitcast_expression_test.cc
new file mode 100644
index 0000000..5803003
--- /dev/null
+++ b/src/tint/ast/bitcast_expression_test.cc
@@ -0,0 +1,81 @@
+// Copyright 2020 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/tint/ast/bitcast_expression.h"
+
+#include "gtest/gtest-spi.h"
+#include "src/tint/ast/test_helper.h"
+
+namespace tint {
+namespace ast {
+namespace {
+
+using BitcastExpressionTest = TestHelper;
+
+TEST_F(BitcastExpressionTest, Create) {
+  auto* expr = Expr("expr");
+
+  auto* exp = create<BitcastExpression>(ty.f32(), expr);
+  EXPECT_TRUE(exp->type->Is<ast::F32>());
+  ASSERT_EQ(exp->expr, expr);
+}
+
+TEST_F(BitcastExpressionTest, CreateWithSource) {
+  auto* expr = Expr("expr");
+
+  auto* exp = create<BitcastExpression>(Source{Source::Location{20, 2}},
+                                        ty.f32(), expr);
+  auto src = exp->source;
+  EXPECT_EQ(src.range.begin.line, 20u);
+  EXPECT_EQ(src.range.begin.column, 2u);
+}
+
+TEST_F(BitcastExpressionTest, IsBitcast) {
+  auto* expr = Expr("expr");
+
+  auto* exp = create<BitcastExpression>(ty.f32(), expr);
+  EXPECT_TRUE(exp->Is<BitcastExpression>());
+}
+
+TEST_F(BitcastExpressionTest, Assert_Null_Type) {
+  EXPECT_FATAL_FAILURE(
+      {
+        ProgramBuilder b;
+        b.create<BitcastExpression>(nullptr, b.Expr("idx"));
+      },
+      "internal compiler error");
+}
+
+TEST_F(BitcastExpressionTest, Assert_Null_Expr) {
+  EXPECT_FATAL_FAILURE(
+      {
+        ProgramBuilder b;
+        b.create<BitcastExpression>(b.ty.f32(), nullptr);
+      },
+      "internal compiler error");
+}
+
+TEST_F(BitcastExpressionTest, Assert_DifferentProgramID_Expr) {
+  EXPECT_FATAL_FAILURE(
+      {
+        ProgramBuilder b1;
+        ProgramBuilder b2;
+        b1.create<BitcastExpression>(b1.ty.f32(), b2.Expr("idx"));
+      },
+      "internal compiler error");
+}
+
+}  // namespace
+}  // namespace ast
+}  // namespace tint